basegfx/source/vector/b3dvector.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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  15  *   License, Version 2.0 (the "License"); you may not use this file
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  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <basegfx/vector/b3dvector.hxx>
  21 #include <basegfx/matrix/b3dhommatrix.hxx>
  22
  23 namespace basegfx
  24 {
  25     B3DVector& B3DVector::normalize()
  26     {
  27         double fLen(std::hypot(mnX, mnY, mnZ));
  28
  29         if(!::basegfx::fTools::equalZero(fLen))
  30         {
  31             const double fOne(1.0);
  32
  33             if(!::basegfx::fTools::equal(fOne, fLen))
  34             {
  35                 mnX /= fLen;
  36                 mnY /= fLen;
  37                 mnZ /= fLen;
  38             }
  39         }
  40         else
  41         {
  42             mnX = 0.0;
  43             mnY = 0.0;
  44             mnZ = 0.0;
  45         }
  46
  47         return *this;
  48     }
  49
  50     B3DVector B3DVector::getPerpendicular(const B3DVector& rNormalizedVec) const
  51     {
  52         B3DVector aNew = cross(*this, rNormalizedVec);
  53         aNew.normalize();
  54         return aNew;
  55     }
  56
  57     B3DVector& B3DVector::operator*=( const ::basegfx::B3DHomMatrix& rMat )
  58     {
  59         const double fTempX( rMat.get(0,0)*mnX + rMat.get(0,1)*mnY + rMat.get(0,2)*mnZ );
  60         const double fTempY( rMat.get(1,0)*mnX + rMat.get(1,1)*mnY + rMat.get(1,2)*mnZ );
  61         const double fTempZ( rMat.get(2,0)*mnX + rMat.get(2,1)*mnY + rMat.get(2,2)*mnZ );
  62         mnX = fTempX;
  63         mnY = fTempY;
  64         mnZ = fTempZ;
  65
  66         return *this;
  67     }
  68
  69     B3DVector operator*( const ::basegfx::B3DHomMatrix& rMat, const B3DVector& rVec )
  70     {
  71         B3DVector aRes( rVec );
  72         aRes *= rMat;
  73         return aRes;
  74     }
  75
  76     bool areParallel( const B3DVector& rVecA, const B3DVector& rVecB )
  77     {
  78         // i think fastest is to compare relations, need no square or division
  79         if(!fTools::equal(rVecA.getX() * rVecB.getY(), rVecA.getY() * rVecB.getX()))
  80             return false;
  81
  82         if(!fTools::equal(rVecA.getX() * rVecB.getZ(), rVecA.getZ() * rVecB.getX()))
  83             return false;
  84
  85         return fTools::equal(rVecA.getY() * rVecB.getZ(), rVecA.getZ() * rVecB.getY());
  86     }
  87
  88 } // end of namespace basegfx
  89
  90 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */